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PROMINE

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Published by Universitas Bangka Belitung

ISSN : 23547316 EISSN : 26207737 DOI : -

Core Subject : Science, Social, Engineering,

Earth & Planetary Sciences Engineering Environmental Science

Jurnal ilmiah dengan nama Promine merupakan terbitan berkala ilmiah Jurusan Teknik Pertambangan Universitas Bangka Belitung yang terbit setiap bulan Juni dan Desember dalam setahun yang meliputi bidang Eksplorasi (Geologi dan Geofisika), Geoteknik/Geomekanika, Pengolahan Minerba, Reklamasi, dan Pasca Tambang.

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Articles 7 Documents

Search results for , issue "Vol 7 No 1 (2019): PROMINE" : 7 Documents clear

Studi Pengaruh Bentuk dan Kemiringan Permukaan Pilar Terhadap Kekuatan dan Faktor Keamanan Pilar Rully Nurhasan Ramadani; Iswandaru Iswandaru; Ridho K. Wattimena; Made A Rai
PROMINE Vol 7 No 1 (2019): PROMINE
Publisher : Jurusan Teknik Pertambangan, Fakultas Teknik, Universitas Bangka Belitung

Study of stability and pillar failure mechanism with a variety of methods have beencarried with empirical and analytical approach. H. Moomivand dan V.S. Vutukuri in 2008 doto research with physical model of coal cubic with ratio of 0,25 to 10 with surface of pillar ishorizontal, this research aims to investigated changes in the ratio of pillar on compressivestrength and pillar mine failure mechanism, to study the relationship do the physical modellingwith 5 variations of height of 5 cm – 40 cm each pillar geometry has 7 variatons inclinedsurface 0o-30o. Samples of the pillar of testing with direction of the axial load on the body pillaruntil failure. Other than that do to 2D numerical modelling with finite element methods withassisted of software Phase2 (Rockscience). Physical modelling result showed the value ofthe compressive strength and the strength of pillar will be increased with the increasing ratioof pillars w/h. Effect of change in the inclined surface pillar to the compressive strength andpillar of strength showed no behavioral changes in the compressive strength and the strengthof the pillars to change the angle of the surface of the pillar. Changes in strength factor andsigma 1 showed decreasing of the value when the angle of the pillar is increasing eventhough the changes in the value of the numerical modeling results are not significant.

Analisis Kestabilan Lereng Pit B Tambang PT. Miyor Pratama Coal, Desa Kumanis Atas Kec. Talawi, Sawahlunto Sumatera Barat Refky Adi Nata; Alexander Alexander
PROMINE Vol 7 No 1 (2019): PROMINE
Publisher : Jurusan Teknik Pertambangan, Fakultas Teknik, Universitas Bangka Belitung

The purpose of this research is a classification of rock from slopes and analyzes safety factor of slope by fellenius and janbu method. This type of research classified as descriptive. For class of rock mass based on bieniawski 1989 and for processing helped with software slide v. 6.0. Research results explain the total weights of Rock Mass Rating (RMR) from the results of the data from field, the total weights is = 46 so the rocks are at class III (moderate), with cohesion value 250 kPa and the friction angle is 30 o. The value of the slope safety factor pit B PT. Miyor Pratama Coal after using the slide programme V. 6.0 with method of Bishop has Safety factor = 2,093, and with Janbu method has safety factor = 2,180. From two methods include safe condition > 1.

Kajian Unsur Tanah Jarang (LTJ) Pada Lahan Bekas Tambang Timah dan Tambang Kaolin Kecamatan Merawang Kabupaten Bangka Delita Ega Andini; Guskarnali Guskarnali; Alfitri Rosita
PROMINE Vol 7 No 1 (2019): PROMINE
Publisher : Jurusan Teknik Pertambangan, Fakultas Teknik, Universitas Bangka Belitung

Indonesia have natural resources in producing rare earth elements (REE). The abundance ofmineral resources in Bangka Island is related to the strategic geological position of BangkaIsland formed on the Southeast Asian Tin Belt (Cobbing, 2005). Geologically, the REEdeposits are associated with acid rocks (granitic) and phosphatic deposits. This studyfocuses on primary samples taken directly from ex tin mining area and ex kaolin mining inMerawang District, Bangka. The analysis of the sample uses X-Ray Fluorescence (XRF) tofind out the REE content are Ce, La, Nd, Sb, Sc, Sm, Te, Th, Y, and U. The analysis resultsshow that the spread of elemental content in the sample tends to have a relatively similarpresence. But in Sample 1 shows the Ce element is the dominant element that is equal to25.19 ppm, equivalent to 0.002% of its availability in sedimentary sand in the ex tin mining.while on the ex kaoline mining area the results of the analysis showed that there wasThorium (Th) content in Sample 3 of 70.05 ppm or 0.007% and was the highest contentcompared to other elements in all samples.

Penaksiran Endapan Timah Primer Menggunakan Metode Resistivitas dan Metode Geomagnetik Di Bukit Sambunggiri Kecamatan Merawang Kabupaten Bangka Mardiah Mardiah; Guskarnali Guskarnali
PROMINE Vol 7 No 1 (2019): PROMINE
Publisher : Jurusan Teknik Pertambangan, Fakultas Teknik, Universitas Bangka Belitung

Cassitterit is a valuable mineral containing tin and other minerals as mining products in the Bangka Belitung Islands region. Sambung giri Hill, Merawang District, Bangka Regency is one of the places where primary tin deposits occur. Estimation of subsurface images can be interpreted using geophysical methods in the form of resistivity methods and geomagnetic methods. The measurement of resistivity method uses 6 lines with dipole-dipole configuration while the geomagnetic method with looping measurement technique as many as 13 lines with each line consists of several measurement points within 20 meters, consisting of 10 lines to the South-North direction, and 3 trajectories to the West- East. Based on the results of the study, the primary tin deposit estimation from the resistivity method in the form of a cross section of resistivity shows a low resistivity value (<700 Ohm.m) while the geomagentic method in the form of Reduction To Equator (RTE) shows a low geomagnetic anomaly (<0.8 nT). The spread of primary tin deposits is estimated to be found in the Northwest-Southeast direction.

Probabilistik Kelongsoran Lereng Tambang Terbuka Grasberg PT Freeport Indonesia Iswandaru Iswandaru; Rully Nurhasan R.; Made Astawa Rai; Ridho K. Wattimena
PROMINE Vol 7 No 1 (2019): PROMINE
Publisher : Jurusan Teknik Pertambangan, Fakultas Teknik, Universitas Bangka Belitung

The stability of a slope in mining activities is highly influenced by geology, especially thenature of rocks and geological structures. Slope stability analysis will be faced with severalproblems in the uncertainty of rock properties and rock mass. Slope stability analysis usingprobabilistic methods offers a more systematic way of treating conditions of uncertainty andprovides other alternatives to the value factor approach to security regarding information onthe probability of a slope failure.Grasberg Open Mine rock type classification based ongeotechnical parameters or Geotechnical Rock Code (GTRCK) classifies rocks based onrock type, rock mechanical properties, hydrothermal alteration type, clay content and RockQuality Designation (RQD) to 46 types of GTRCK. The GTRCK type which has a low rockmass strength value is a change in intrusive rock minerals and a low RQD value such as alot of clay material is exposed in the Northeast and Southwest of the Grasberg Open PitMine.The overall slope probabilistic modeling of the Grasberg mine uses a cross section of220o (northwest) with the effect of a 0.02g seismic factor which is the maximum criterionaccording to the probability of slope failure received with the average FK 1.13 and PK 0%.

Analisis Keamanan Tebing Pada Areal Bekas Tambang Di Desa Semaya, Kecamatan Randudongkal, Kabupaten Pemalang Rinal Khaidar Ali; Najib Najib; Adam Kahfi Mulyadi
PROMINE Vol 7 No 1 (2019): PROMINE
Publisher : Jurusan Teknik Pertambangan, Fakultas Teknik, Universitas Bangka Belitung

Mining activities has become increasingly widespread in recent years, especially people’s mining, thatjust concerned about the result and not paying attention to the environmental factors.This is causedthe post mining area’s destruction and environmental degradation potential. For this reason, the slopesafety factor enhancement analysis on the post mining area in Semaya Village, Randudongkal Sub-District, Pemalang Regency is needed. Slope stability analysis using Slide 6.0 software to identify thecondition of post mining area from the results of undisturbed sample (UDS) laboratory data.Laboratory testing includes several aspects including water content, weight, specific gravity, grain size,atteberg limit test, and direct shear test. The value of the safety factor is 1,441, the value is in the safecategory because it passes the minimum value limit of the safety factor which is 1.25, this result isobtained from the terracing modeling.

Pengaruh Struktur Kekar Terhadap Kestabilan Lereng Di PT. Energi Batubara Lestari Kalimantan Selatan Yudho Dwi Galih C; Arrina Khanifa
PROMINE Vol 7 No 1 (2019): PROMINE
Publisher : Jurusan Teknik Pertambangan, Fakultas Teknik, Universitas Bangka Belitung

PT. Energi Batubara Lestari ( EBL ) merupakan tambang batubara yang menggunakan sistemtambang terbuka, sehingga membutuhkan keamanan lereng untuk terciptanya lingkunganpenambangan yang aman dan kondusif. Penelitian ini bertujuan untuk menganalisis kemantapanlereng, dalam penelitian ini digunakan metode kesetimbangan batas. Keadaan geologi yang terdapatpada PT. EBL terdapat kekar, litologi pasir, pasir lepas, lempung dan batubara, kekar mempengaruhikestabilan lereng karena semakin banyak celah, air yang masuk akan semakin mudahmempengaruhi batuan yang lapuk sehingga mengalami kelongsoran. Kajian kemantapan lereng padasisi highwall sisi A-A’ mendapatkan nilai FK 1.851, sisi highwall sisi B-B’ didapatkan FK 1.676 dan sisihighwall sisi C-C’didapatkan FK 1.54 menandakan bahwa lereng highwall dalam kondisi aman. Danpada sisi lowwall sisi A-A’ didapatkan nilai FK 1.198 , pada sisi lowwall sisi B-B’ didapatkan nilai FK0.94, dan sisi lowwall sisi C-C’ didapatkan nilai FK 1.27, menandakan bahwa pada lereng lowwalldalam konidi kritis. Untuk membuat suatu lereng yang stabil atau aman dilakukan desain geometrilereng pada daerah lowwall dengan merubah tinggi dan overall slope sehingga didapatkan hasil FKantara lain : sisi desain A-A’ lereng lowwall 1.478, sisi desain B-B’ lereng lowwall 1.447 sedangkan sisidesain C-C’ lereng lowwall 1.497.

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Guskarnali

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Kab. bangka,

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